exoparg3.c File Reference

#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "acparser.h"
#include "amlcode.h"

Include dependency graph for exoparg3.c:

Go to the source code of this file.

Macros
#define	_COMPONENT   ACPI_EXECUTER

Functions
ACPI_STATUS	AcpiExOpcode_3A_0T_0R (ACPI_WALK_STATE *WalkState)
ACPI_STATUS	AcpiExOpcode_3A_1T_1R (ACPI_WALK_STATE *WalkState)

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_EXECUTER

Definition at line 51 of file exoparg3.c.

Function Documentation

AcpiExOpcode_3A_0T_0R()

ACPI_STATUS AcpiExOpcode_3A_0T_0R

(

ACPI_WALK_STATE *

WalkState

)

Naming convention for AML interpreter execution routines.

The routines that begin execution of AML opcodes are named with a common convention based upon the number of arguments, the number of target operands, and whether or not a value is returned:

 AcpiExOpcode_xA_yT_zR

Where:

xA - ARGUMENTS: The number of arguments (input operands) that are required for this opcode type (1 through 6 args). yT - TARGETS: The number of targets (output operands) that are required for this opcode type (0, 1, or 2 targets). zR - RETURN VALUE: Indicates whether this opcode type returns a value as the function return (0 or 1).

The AcpiExOpcode* functions are called via the Dispatcher component with fully resolved operands. !

Definition at line 91 of file exoparg3.c.

{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_SIGNAL_FATAL_INFO  *Fatal;
    ACPI_STATUS             Status = AE_OK;
 
 
    ACPI_FUNCTION_TRACE_STR (ExOpcode_3A_0T_0R,
        AcpiPsGetOpcodeName (WalkState->Opcode));
 
 
    switch (WalkState->Opcode)
    {
    case AML_FATAL_OP:          /* Fatal (FatalType  FatalCode  FatalArg) */
 
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
            "FatalOp: Type %X Code %X Arg %X "
            "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
            (UINT32) Operand[0]->Integer.Value,
            (UINT32) Operand[1]->Integer.Value,
            (UINT32) Operand[2]->Integer.Value));
 
        Fatal = ACPI_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO));
        if (Fatal)
        {
            Fatal->Type = (UINT32) Operand[0]->Integer.Value;
            Fatal->Code = (UINT32) Operand[1]->Integer.Value;
            Fatal->Argument = (UINT32) Operand[2]->Integer.Value;
        }
 
        /* Always signal the OS! */
 
        Status = AcpiOsSignal (ACPI_SIGNAL_FATAL, Fatal);
 
        /* Might return while OS is shutting down, just continue */
 
        ACPI_FREE (Fatal);
        goto Cleanup;
 
    case AML_EXTERNAL_OP:
        /*
         * If the interpreter sees this opcode, just ignore it. The External
         * op is intended for use by disassemblers in order to properly
         * disassemble control method invocations. The opcode or group of
         * opcodes should be surrounded by an "if (0)" clause to ensure that
         * AML interpreters never see the opcode. Thus, something is
         * wrong if an external opcode ever gets here.
         */
        ACPI_ERROR ((AE_INFO, "Executed External Op"));
        Status = AE_OK;
        goto Cleanup;
 
    default:
 
        ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
            WalkState->Opcode));
 
        Status = AE_AML_BAD_OPCODE;
        goto Cleanup;
    }
 
 
Cleanup:
 
    return_ACPI_STATUS (Status);
}

AcpiExOpcode_3A_1T_1R()

ACPI_STATUS AcpiExOpcode_3A_1T_1R

(

ACPI_WALK_STATE *

WalkState

)

Definition at line 173 of file exoparg3.c.

{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
    char                    *Buffer = NULL;
    ACPI_STATUS             Status = AE_OK;
    UINT64                  Index;
    ACPI_SIZE               Length;
 
 
    ACPI_FUNCTION_TRACE_STR (ExOpcode_3A_1T_1R,
        AcpiPsGetOpcodeName (WalkState->Opcode));
 
 
    switch (WalkState->Opcode)
    {
    case AML_MID_OP:    /* Mid (Source[0], Index[1], Length[2], Result[3]) */
        /*
         * Create the return object. The Source operand is guaranteed to be
         * either a String or a Buffer, so just use its type.
         */
        ReturnDesc = AcpiUtCreateInternalObject (
            (Operand[0])->Common.Type);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }
 
        /* Get the Integer values from the objects */
 
        Index = Operand[1]->Integer.Value;
        Length = (ACPI_SIZE) Operand[2]->Integer.Value;
 
        /*
         * If the index is beyond the length of the String/Buffer, or if the
         * requested length is zero, return a zero-length String/Buffer
         */
        if (Index >= Operand[0]->String.Length)
        {
            Length = 0;
        }
 
        /* Truncate request if larger than the actual String/Buffer */
 
        else if ((Index + Length) > Operand[0]->String.Length)
        {
            Length =
                (ACPI_SIZE) Operand[0]->String.Length - (ACPI_SIZE) Index;
        }
 
        /* Strings always have a sub-pointer, not so for buffers */
 
        switch ((Operand[0])->Common.Type)
        {
        case ACPI_TYPE_STRING:
 
            /* Always allocate a new buffer for the String */
 
            Buffer = ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
            if (!Buffer)
            {
                Status = AE_NO_MEMORY;
                goto Cleanup;
            }
            break;
 
        case ACPI_TYPE_BUFFER:
 
            /* If the requested length is zero, don't allocate a buffer */
 
            if (Length > 0)
            {
                /* Allocate a new buffer for the Buffer */
 
                Buffer = ACPI_ALLOCATE_ZEROED (Length);
                if (!Buffer)
                {
                    Status = AE_NO_MEMORY;
                    goto Cleanup;
                }
            }
            break;
 
        default:                        /* Should not happen */
 
            Status = AE_AML_OPERAND_TYPE;
            goto Cleanup;
        }
 
        if (Buffer)
        {
            /* We have a buffer, copy the portion requested */
 
            memcpy (Buffer,
                Operand[0]->String.Pointer + Index, Length);
        }
 
        /* Set the length of the new String/Buffer */
 
        ReturnDesc->String.Pointer = Buffer;
        ReturnDesc->String.Length = (UINT32) Length;
 
        /* Mark buffer initialized */
 
        ReturnDesc->Buffer.Flags |= AOPOBJ_DATA_VALID;
        break;
 
    default:
 
        ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
            WalkState->Opcode));
 
        Status = AE_AML_BAD_OPCODE;
        goto Cleanup;
    }
 
    /* Store the result in the target */
 
    Status = AcpiExStore (ReturnDesc, Operand[3], WalkState);
 
Cleanup:
 
    /* Delete return object on error */
 
    if (ACPI_FAILURE (Status) || WalkState->ResultObj)
    {
        AcpiUtRemoveReference (ReturnDesc);
        WalkState->ResultObj = NULL;
    }
    else
    {
        /* Set the return object and exit */
 
        WalkState->ResultObj = ReturnDesc;
    }
 
    return_ACPI_STATUS (Status);
}